Sawing machine



March 3, 1931. I I M 1,794,758

SAWING' MACHINE Filed Feb. 21. 1927 8 Sheets-Sheet 1 Z [710/ rrm m9.

March 3, 1931. I D|TTMAR 1,794,758

SAWING MACHINE Filed Feb. 21, 1927 8 Sheets-Sheet 2 I. F. DITTMAR SAWINGMACHINE March 3, 1931.

Filed Feb. 21, 1927 8 Sheets-Sheet 3 March 3, 1931. F, DITTMAR 1,794,758

SAWING MACHINE I Filed Feb. 21, 1927 8 Sheets-Sheet 4 flai? J I 4 JJ Zgwwmlioz March 3, 1931. D|TTMAR 1,794,758

SAWING MACHINE Filed Feb. 21, 1927 8 Sheets-Sheet 5 I. F. DITTMAR SAWINGMACHINE March 3, 1931.

Filed Feb. 21, 1927 8 Sheets-Sheet 6 If ZD/TfM/M.

March 3, 1931. I. F. DITTMAF! 1,794,758

SAWING MACHINE Filed Feb. 21, 1927 8 Sheets-Sheet '7 mils. ,4 \FA N NW"NW" w my; I if H 4) F. DITTM SAWING MACHINE March 3 1931.

8 Sheet -s 8 Filed Feb. 21 1927 mam Patented Mar. 3, 1931 UNITED STATESPATENT OFFICE IB'VIN I. DITTMAB, OF WILLIAMSPORT, FENNBYLVLNI, ASSIGNOBTO THE (mom COMPANY, OF WILLIAMSPOBT, PENNSYLVANIA, A; OOBPOBLTIOK OIPENNSYL- VANIA.

sawmd ncrmrn vide novel means for mounting the saw in respect to thecarriage so that the same can be adjusted in respect to the carriage ortable where y the circumference or the cutting circle of the saw can beshifted so as to adjust it to the proper position.

Another object of the invention is to provide a sawing machine in whichthe motor is so constructed that a clearance is formed for the operatorshands when placing a piece of material on the table or removing the sametherefrom, the motor support being adjustable so as to shift the same inrespect to the carriage. v

Another object of my invention is to provide an electric motor in whichthe driving shaft is so constructed that the saw can beplaced on eitherend thereof to either side of the motor.

A still'further object of the invention is to provide a novel form ofguard for the saw which is adjustable so that the lower edge thereof canbe shifted to such a position that it clears the material being sawed.

A still further object of the invention is to provide novel means formounting the table so that it is maintainedin such a position that thematerial thereon will be forced into engagement with the cutting edge ofthe saw to'form a perfect right angle cut, the table being adjustable.

table, but aids in returning the same.

site side to that of Figu Another object of the invention is to proOther and further objectsand advantages of the invention will behereinafter set forth and the novel features thereof defined by theappended claims.

In the drawin s, c

Figure 1 is a ront elevation of a sawing machine constructed inaccordance with my invention; 4

Figure 2 is a side elevation showing a table arranged on an incline indotted lines;

Fi ure 3 is a side elevation from the oppo- Figure 4 is a detail View ofthe bumper with the table; 7

Figure 5 is an enlarged vertical section through aportion of the frame,track and carriage showing the manner of mounting the same;

Figure 6 is a detail top plan view of a portion of a carriage; v

Figure 7 is an elevation of the same; Figure 8 is a vertical sectiontaken on line 8-8 of Figure 6;

Figure 9 is an end elevation'of the table; Figure 10 is a sectionthrough the saw sup? port showing the motor in plan view, showing a sawin dotted lines arranged on the other end of the shaft; 7

Figure 11 is an elevation of a standard for the motor support;

Figure 12 is a vertical section through the motor support; 7

Figure 13 is a horizontal section through the motor support; v

Figure .14 is a detail elevation of one of the sections of the motor suport;

Figure 15 is an edge view 0 the same; Figure 16 is a section showing themanner of. securing the saw on the motor shaft; Figure 17 is a sectionthrough the table showing the construction of the saw throat;

Figure 18 is a detail top plan view of the same;

Figure 19 is a diagrammatic view showing the saw adjusted so as to cutsubstan- 22, the top portion of which is closed by the tially at thehorizontal diameter of the cut- In the rawings 1 indicates a supporting,

frame on which is disposed a horizontally disposed frame 2 and while inthe drawing I have shown these members formed sepa rate, it, of course,is understood that they can be formed as a unit.

The frame 2 along each end is rovided with a vertically disposed rib 3an a horizontally disposed rib 4. The rib 3 is provided with threadedbores 5 adapted to receive bolts or screws 6 which extend through slots7 formed in track 8, which is rovided with a substantially V-shaped treaportion 9, the lower edge of said track being adapted to be engaged by abolt 10 mounted in a threaded bore 11 of the horizontally disposed rib 4so that the track can be adjusted up and down. As one of these means forfastening the same is arranged at each end of the track, of course, itcan be clearly understood that the track can be adjusted to any inclinedposition desired for the purpose hereinafter fully described.

Arranged above the frame 2 is a table 12 which is provided adjacent eachend with a substantially inverted U-shaped portion 13 having the legsthereof formed with oppositely disposed openings 14 in which areadjustably mounted cone members 15 and 16 for the balls 17 on which aremounted rollers 18 having peripheral grooves corresponding in shape tothe tread of the track 9 so that the table will be mounted on ballbearings so as to travel back and forth freely.

The cone member 16 is provided with a. threaded stem 16' which worksinto a threaded bore 15' of the cone member 15 so as toadjust the conemembers in respect to one another, a set screw 19 being mounted in theend of the bore 15' for preventing the stem from turning after beingadjusted in the proper position.

After the cone members have been set in the proper positions to supportthe balls and grooved rollers, they can be locked in the hanger formedby the inverted U-shaped portion of the table by the set screw 20mounted in the threaded bore 21 of one of the legs of the hangerasclearly shown in Figure 5." This provides means for mounting the tableon ball bearing grooved rollers mounted in.

hangers. so as toprotect the ball bearings from the sawdust and alsoprovides means so that the table can be squared in respect to the saw byadjusting the cone members in'the han ers.

. T e table is provided with a central throat convexed insert of Babbittmetal 23 having a slot 24 to receive the saw as will be hereinafterfully described. The insert extends u wardly beyond the top surface ofthe tab 0 so as to slightly undercut the material, which is ofespecialadvantage when cutting floorin adjustable gilzuge 25 is arrangedon the table a ainst whic the material is placed and held w ile beingcut as clearly shown in Figures 2 and 3.

The throat 22 is provided with a dependin bifurcated In 26 whichstraddles a rod 2 provided with threaded ends mounted in threaded boresformed in bosses 28 of the frame 2, said rod being surrounded bycoilsprings 29 at each end carrying washers 30 at their free end which areadapted to be engaged by the bifurcated lug 26, the sprin 7 beingadjusted on the rod by nuts 31 to lim1t the forward and backwardmovement of the table. These springs act as buffers so as to eliminatethe shock when the table has reached its end of movement in bothdirections.

In practice the table is set at an incline so that after it has beenforced towards the saw, it will return b gravity and by having thespring arrange so that the bifurcated lug engages the same at the end ofthis movement, when released the tension of the spring has a tendency tostart the table so that the table moves back automatically.

The end of the table is provided with bifurcated portions 33 to providemeans for connecting extension members, not shown, to increase thelength of the table in cutting long material such as flooring and thelike.

Mounted on the frame 2 is a standard 34, said standard being capable ofbeing mounted on the frame to either side of the throat of the table,said standard extending u wardly at anangle of 60 in res ect to t etable surface and is provided wit an apertured lug 35 at its to for thepurpose hereinafter fully described The standard 34 is provided withside flanges 36 against which are arranged stri s 37 having inclinedfaces 38 to provide a su stantially dove-tailed shaped ideway in whichis mounted the dove-tailed sha d tongue 39 of a motor support 40 to whicis bolted the base 41 of an electric motor 42, the construction of whichwill be hereinafter fully described.

The guide strips 37 are secured in position by bolts 43 and aread'ustable therein by set screws 44 so that as t e tongue and thecontacting faces of these guide strips wear, they can ber 'adjusted soas to maintain a tight fit, the bolts 43 being mounted in bores of agreater diameter in order to allow the same to slide back and forth. 1

The dove-tailed shaped ton e 39 of the motor support is provided with alongitu dinally disposed groove 45 which is connected together by a web46 having a threadedbore i 148. which is revolublyimounted'at itsu per.

v be placed on either end so that the standard end in the, lug '35 andis provided with it oh 49 for rotating the same in order to adjust theelectric motor up and down in respect to the table.

The electric motor is especially constructed and is provided with a flatside which is approximately at right angles in respect to the slide onwhich the motor is mounted in order to give room for the operators handin grasping the strip in holding it against the adjustable gauge on thetable.

The driving shaft of the motor extends outwardly to each side in orderto allow a saw to be mounted on either end thereof and when the saw ison one end, the other end is closed by a housing 50. The drive shaft 51is threaded at each end and carries a saw clamp 52 for clamping acircular saw 53 thereon, the construction of each end of the drive shaftbeing the same which enables the saw to can be shifted lengthwise of theframe so as to place the electric motor to either side of the throat ofthe table.

The standard is provided on its back with spaced apertured lugs 54adapted to receive a shaft 55 on which is mounted a hub 56 of asectional guard composed of sections 57 and 58 pivotally connectedtogether at 59 and held in contact with one another by a U-shaped clip60. The sections 57 and 58 are provided with elongated slots 61, theslot on the outer section being closed by a cover plate 62.

The hub members 56 are formed detachable and are secured in position onthe sections by screws as clearly shown, which allows the same guard tobe used when the saw is transferred from one end of the drive shaft ofthe motor to the other. The hub portion is provided with threaded lugs63 in which are adjustably mounted stop screws 64 adapted to engage thestandard 34 so as to limit the swinging movement of the guard in respectto the table and in practice the guard is set so that it just ridesclear of the material being sawed which eliminates any fllC{// tion andthe possibility of the operators fi I gers coming in contact with therotary safw. By having the saw guard formed of two 5! ctions pivotallyconnected together at their upper edge and adapted to swing in respectto the other, by removing the- U-shaped spring clip 60, the outersection can be swung outwardly so that the saw can be inserted orremoved.

The frame 2 and table are of skeleton form so that a clearance is formedfor the pieces of material cut ofi from the end "of the strip in orderto allow the same to drop into a chute and by having the throatconstructed as shown, the sawdust canbe readily drawn away in the usualmanner.

In the operation of the saw as herein shown and described which is c;

ada ted to be used for trimming t e ends of ooring where it is desiredto have an exceptionally clean and true cut, the strip of material isplaced on the table by the oper tor and as the electric motor is drivingt e circular saw at a high rate of speed, when the strip is forced intocontact with the cuttingedge, the strip is cut at right angles and byhaving the convexed Babbitt throat extending upwardly beyond the surfaceof the table, the ends are slightly undercut so that when the ends arelaced together, a square joint closed at tEe top surface is formed.

The table is mounted upon grooved rollers which in turn travel onadjustably mounted tracks, the tracks being-adjustable for changing theinclination thereof in order to allow the table to be set so that in theoperation of the sawing machine, when the operator places a piece ofmaterial against the gauge thereof he forces the table towards thesawagainst the force of gravity so that when the piece of material has beencut and the table released, it will return to its normal position. Therollers being adjustable allow the table to be adjusted and trued sothat the material on the table will be maintained at right angles to thesaw at all times and by having a throat formed of Babbitt metal, thethroat can be removed and a new one inserted as it wears.

By having the saw carried directly upon the motor shaft, it can beshifted from one end to the other and by having the motor adjustablymounted, it can be adjusted in respect to the table so that varioussizes of saws can be used.

From the foregoing description it will be seen that I have progided avery novel form of sawing machine in which a flat-sided electrical motoris employed for driving the saw directly at a high rate of speed so thatwhen a piece of material carried by the movable table is forced intoengagement therewith, it will out quickly and truly, the construction ofthe machine being Very simple and the parts so arranged that all dangerof getting out of order in operation is prevented.

By having the motor adjustably mounted various diameters of saws can beused and the circumference of the saw adjusted so that the cuttingcircle can be properly adjusted to any material whether soft or hard. oropen or closed grain, whereby I am able to adjust the saw and to usesaws with teeth of various constructions to suit the material beingoperated on in order to obtain a smooth, clean cut and by having thetable constructed as shown, the material 'cut off the end of the stripdrops through the table without handling.

It will also be seen that by having the throat on a plane slightly abovethe table cially that the edge of the material is undercut slightly sothat when two strips are arranged with their ends in en agement with oneanother a very smoot tight joint can be formed.

What I claim is:

1. A motor support having a motor mounted thereon provided with a driveshaft extending out to each side thereof'adapted to receive a saw, aguard supporting shaft carried by said support and arranged parallelwith said drive shaft, a guard having oppositely disposed hub portionsadapted to be pivotally mounted on either end of said supporting shaftadapted to enclose said saw, and means carried by said hub portions forlimiting the swinging movement of said guard in one direction.

2. A motor support having a motor mounted thereon provided with a driveshaft extending out to each side thereof adapted to receive a saw, aguard supporting shaft carried by said support and arranged parallelwith said drive shaft, a sectional guard enclosing said saw havingoppositely disposed hub portions adapted to be pivotally mounted oneither end of said supporting shaft and means for limiting the swingingmovement of said guard.

3. An interchangeable guard for sawing machines having a drive shaft forattaching a saw to either end thereof comprising sectional memberspivotally connected together at their upper ends, each section having adetachable hub for supporting the guard over the saw and a 'U -shapedmember for clamping said sections together, said hub being adapted to bepivotally mounted on its supporting shaft arranged parallel with thedrive shaft.

4. In a sawing machine the combination with a saw carrying shaft havingmeans for clamping a saw to either end thereof, a supporting shaftarranged parallel with the saw carrying shaft, of a guard capable ofbein mounted'to' enclose either of said saws, sai guard being pivotallymounted on the supporting shaft and means for limiting the swingingmovement of said guard.

5. A motor support having a motor mount- .ed thereon provided with adrive shaft extending out to each side thereof adapted to receive a saw,a guard supporting shaft carried by said support and arranged parallelwith the drive shaft, a sectional guard adapted to be mounted on eitherend of said supporting shaft formed of two sections pivotally connectedtogether at their upper edges for enclosing said saw and means forlimiting the swinging movement of said guard.

6. A motor support having a motor mounted thereon provided with a driveshaft extending out to each side thereof adapted to receive a saw, aguard supporting shaft carried by said support and arranged parallelwith the drive shaft,-a sectional guard adaptsignature.

IRVIN F. DITTMAR.

